#include "bits/stdc++.h"

using namespace std;

int main() {
	int n,i,x[100001];

	cin>>n;
	memset(x,100001,sizeof(x));
	for(i=n;i--;)cin>>x[i];

	sort(x,x+n,greater<int>());
	for(i=n-1;i>=1;i--)x[0]+=x[i]/2;

	cout<<x[0]<<endl;
	return 0;
}